Micropower Op Amp, Comparator and Reference Features: Quiescent Current: 5µA Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700µV Max Reference Output Drives 0.01µF Capacitor Internal 1.2V ±0.4% Reference Output (LTC1541) Low Input Bias Current: 1nA Max Reference Output Can Source Up to 2mA Internal ±2.25mV Comparator Hysteresis Comparator and Op Amp Input Range Includes Ground Op Amp Capable of Driving Up to 1000pF Load Unity-Gain Stable and 12kHz Bandwidth 2.5V to 12.6V Supply Voltage Range Pin Compatible Upgrade for MAX951/MAX953 Available in 3mm × 3mm × 0.8mm DFN Package

Micropower Op Amp, Comparator and Reference Features: Quiescent Current: 5µA Typ Outputs Swing Rail-to-Rail Low Op Amp Offset Voltage: 700µV Max Reference Output Drives 0.01µF Capacitor Internal 1.2V ±0.4% Reference Output (LTC1541) Low Input Bias Current: 1nA Max Reference Output Can Source Up to 2mA Internal ±2.25mV Comparator Hysteresis Comparator and Op Amp Input Range Includes Ground Op Amp Capable of Driving Up to 1000pF Load Unity-Gain Stable and 12kHz Bandwidth 2.5V to 12.6V Supply Voltage Range Pin Compatible Upgrade for MAX951/MAX953 Available in 3mm × 3mm × 0.8mm DFN Package

Software-Selectable Multiprotocol Transceiver Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 and NET2 Compliant (Test Report No. NET2/102201/97) TBR2 Compliant (Test Report No. CTR2/022701/98) Software-Selectable Cable Termination Using the LTC1344A Complete DTE or DCE Port with LTC1544, LTC1344A Operates from Single 5V Supply

Software-Selectable Multiprotocol Transceiver Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV/Detecon Inc. Certified NET1 and NET2 Compliant (Test Report No. NET2/102201/97) TBR2 Compliant (Test Report No. CTR2/022701/98) Software-Selectable Cable Termination Using the LTC1344A Complete DTE or DCE Port with LTC1544, LTC1344A Operates from Single 5V Supply

Software-Selectable Multiprotocol Transceiver with Termination Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV Telecom Services Inc. Certified NET1, NET2 and TBR2 Compliant On-Chip Cable Termination Pin Compatible with LTC1543 Complete DTE or DCE Port with LTC1544 Operates from Single 5V Supply Small Footprint

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Backup Battery Controller with Fixed Output Features: Not Recommended For New Designs. Contact Analog Devices for Potential Replacement. Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package Generates Fixed Backup Voltage (3.07V/4.63V) from a Single 1.2V NiCd Button Cell Automatic Main Supply to Backup Switching Minimum 100mW Output Power Automatic Fast Recharge of NiCd Battery Programmable NiCd Trickle Charge Current Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup Onboard Power-Up and Push-Button Reset Generator Performs VCC Supervisory Functions Reset Assertion Guaranteed at VCC = 1V Short-Circuit Protection Thermal Limiting

Backup Battery Controller with Fixed Output Features: Not Recommended For New Designs. Contact Analog Devices for Potential Replacement. Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package Generates Fixed Backup Voltage (3.07V/4.63V) from a Single 1.2V NiCd Button Cell Automatic Main Supply to Backup Switching Minimum 100mW Output Power Automatic Fast Recharge of NiCd Battery Programmable NiCd Trickle Charge Current Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup Onboard Power-Up and Push-Button Reset Generator Performs VCC Supervisory Functions Reset Assertion Guaranteed at VCC = 1V Short-Circuit Protection Thermal Limiting

Backup Battery Controller with Fixed Output Features: Not Recommended For New Designs. Contact Analog Devices for Potential Replacement. Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package Generates Fixed Backup Voltage (3.07V/4.63V) from a Single 1.2V NiCd Button Cell Automatic Main Supply to Backup Switching Minimum 100mW Output Power Automatic Fast Recharge of NiCd Battery Programmable NiCd Trickle Charge Current Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup Onboard Power-Up and Push-Button Reset Generator Performs VCC Supervisory Functions Reset Assertion Guaranteed at VCC = 1V Short-Circuit Protection Thermal Limiting

1MHz/500kHz Continuous Time Low Noise, Lowpass Elliptic Filter Features: 5th Order, 1MHz Elliptic Filter in SO-8 Package Pin Selectable 1MHz/500kHz Cutoff Frequency Signal-to-Noise Ratio (SNR): 75dB Signal-to-Noise Ratio with –63dB THD: 69dB Passband Ripple (fCUTOFF = 1MHz): ±0.3dB Stopband Attenuation Better Than 60dB No External Components Required

Very Low Noise, Low Distortion Active RC Quad Universal Filter Features: Continuous Time—No Clock Four 2nd Order Filter Sections, 10kHz to 150kHz Center Frequency ±0.5% Typical Center Frequency Accuracy ±0.3% Typical Center Frequency Accuracy (A Grade) Wide Variety of Response Shapes Lowpass, Bandpass and Highpass Responses 103dB Typical S/N, ±5V Supply (Q = 1) 97dB Typical S/N, Single 5V Supply (Q = 1) 96dB Typical S/(N + THD) at ±5V Supply, 20kHz Input Rail-to-Rail Input and Output Voltages DC Accurate to 3mV (Typ) “Zero-Power” Shutdown Mode Single or Dual Supply, 5V to 10V Total Resistor-Programmable fO, Q, Gain

Very Low Noise, Low Distortion Active RC Quad Universal Filter Features: Continuous Time—No Clock Four 2nd Order Filter Sections, 10kHz to 150kHz Center Frequency ±0.5% Typical Center Frequency Accuracy ±0.3% Typical Center Frequency Accuracy (A Grade) Wide Variety of Response Shapes Lowpass, Bandpass and Highpass Responses 103dB Typical S/N, ±5V Supply (Q = 1) 97dB Typical S/N, Single 5V Supply (Q = 1) 96dB Typical S/(N + THD) at ±5V Supply, 20kHz Input Rail-to-Rail Input and Output Voltages DC Accurate to 3mV (Typ) “Zero-Power” Shutdown Mode Single or Dual Supply, 5V to 10V Total Resistor-Programmable fO, Q, Gain

Active RC, 4th Order Lowpass Filter Family Features: Extremely Easy to Use—A Single Resistor Value Sets the Cutoff Frequency (256Hz < fC < 256kHz) Extremely Flexible—Different Resistor Values Allow Arbitrary Transfer Functions with or without Gain (256Hz < fC < 256kHz) Supports Cutoff Frequencies Up to 360kHz Using FilterCAD™ LTC1563-2: Unity-Gain Butterworth Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain LTC1563-3: Unity-Gain Bessel Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain Rail-to-Rail Input and Output Voltages Operates from a Single 3V (2.7V Min) to ±5V Supply Low Noise: 36µVRMS for fC = 25.6kHz, 60µVRMS for fC = 256kHz fC Accuracy < ±2% (Typ) DC Offset < 1mV Cascadable to Form 8th Order Lowpass Filters Available in Narrow SSOP-16 Package